Back support cushion



FIG. 1 is a perspective view of a back support cushion showing my newdesign;

FIG. 2 is a top plan view thereof, the bottom plan view being a mirrorimage thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view, the left side view being amirror image; and,

FIG. 5 is a rear elevational view thereof.

The ornamental design for a back support cushion, as shown anddescribed.